adjective (a)

• not similar(adj.all)

  Example:
  A group of very dissimilar people.
  A pump not dissimilar to those once found on every farm.
  Their understanding of the world is not so dissimilar from our own.
  Took different (or dissimilar) approaches to the problem.
  

  Antonym:
  similar
  

  source: wordnet30
• not alike or similar(adj.all)

  Synonym:
  unalike
  Antonym:
  alike, like, similar
  

  source: wordnet30
• marked by dissimilarity(adj.all)

  Synonym:
  different, unlike
  Antonym:
  like, similar
  

  source: wordnet30
• Not similar; unlike; heterogeneous; as, the tempers of men are as dissimilar as their features.(adjective)

  source: webster1913